Seiko Cal. 4550 - 166

The Seiko 4550-166 represents an important milestone in Seiko's 1983 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-9bec5ec9ec26]

Also known as: Helmet, Flighty

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

15.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1983

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